If your pet frolics in the backyard during Summer months, providing water is absolutely necessary! Hot dogs may not pant when they are thirsty, but still need refreshment when the play gets vigorous and their body temps rise. Instead of just adding a bowl (which can become stagnant and harbor diseases like Giardia), the WaterDog ($79) offers the cold beverage on tap whenever he's ready to sip. Using ultrasonic sensing technology to tell when your animal approaches, it immediately turns on a gentle flow of fresh, cool liquid when he's ready. Pup can drink as long as he wants as the flowing fountain will continue until he moves away – that's one tall glass of water!